A 3-year-old girl accidentally shot her pregnant mother from the backseat of car Tuesday after the woman's boyfriend allegedly left the loaded gun there, according to police in northwest Indiana.

The shooting happened Tuesday afternoon in Merrillville when the boyfriend walked into a store and left the loaded gun in the car between the console and the seat, Merrillville police chief Joseph Petruch told ABC News.

The gun owner's pregnant girlfriend, whom police did not name, sat in the driver's seat in the parking lot with her children, ages 3 and 1, in the backseat, Petruch said.

"ENFIELD, N.C. (WNCN) - A fourth person has been charged in connection with the August 2017 quadruple murder in Enfield, authorities confirmed.

Dontayvious Devonte Cotton, aka “Moochie”, 24, of Weldon faces four charges of murder, one charge of robbery with a dangerous weapon and one charge of burglary, Sheriff Wes Tripp said.

He was already in custody at the Halifax County Jail on separate charges unrelated to the quadruple murder.

Keyon Quarice West, 23, and James Edward Powell, 25, both of Roanoke Rapids, and Matthew Simms, of Enfield, are also charged in the killings, according to authorities.

All four are charged in connection with the Aug. 21, 2017 murder of James and Janice Harris along with James and Peggy Whitley.

Authorities say two couples were playing cards in a home when the killings happened.

Powell was already facing charges of murder, attempted murder and robbery with a dangerous weapon in connection with a Saturday killing in the area of Deer Run Drive in Roanoke Rapids, according to a social media post by Halifax County Sheriff Tripp.

Simms was awaiting trial on a separate killing at the time of the slayings in Enfield, but had bonded out and then failed to appear for court, according to online records.